语法总结
had better与 must
had better表示“最好还是”、“最好”，表达某种忠告或建议。 句型：had better do sth. must则表示“必须”、“一定”，语气比 had better强烈。 had better表示现在时或将来时，而不是过去时。 其否定形式为 had better not do sth. We had better wait and watch for a better chance. 我们最好等一等，寻找更好的机会。 When it rains, you had better not go out. 天下雨的时候，你最好别出去。 You had better be overhauled by a doctor. 你最好给医生详细检查一下。 You had better do a little hard thinking. 你最好仔细想一下。 If you can't finish the book by then, you must come and renew it. 这本书如果你到时候还看不完, 就必须来续借。
例：had better表示“最好还是”、“最好”，表达某种忠告或建议